My 1997 SL is not starting. This is not all the time,just when i need it the most, or when i've stopped for gas at midnight on the interstate 200 miles from home. (Oh yes!) Turn the key nothing happens. Have headlights,interior,radio. tried jumping it,no help.The first time it did it we had stopped for gas, pump was out so started it moved to other side turned it off then it wouldn't start. tried jumping it two times,no luck, turned key on at least 50 times...no luck, then the third guy who stopped to help tried tightening the ground,tried it again it started. Started a dozen or so times over the next couple of days and it did it again. Tryed turning the negative terminal tighter again, tried it ,it started so it must be the ground right? Well replaced the ground battery cable, tried it several times while it sat there started fine. Moved it 50 feet or so,tryed it again wouldn't start. Kicked it...so much for the ground wire theory.Got up the next morning went out..it started. Drove it to advanced and had them hook it up to check battery/alternator/charging. Machine says everything is fine. Decided to give it another chance next morning, started, drove about 1/2 mile, forgot cell phone,ran back, turned it off ,ran back out, won't start. Now ready to use it for target practice.Still keep thinking its something to do with the battery wires because everytime it has started back up,with the exception of letting it sit overnight, i had just messed with the wires. Also am wondering if its a coincidence that all three times it's pulled this it had been started, ran for a short distance, and turned off.Also noticed that although i have interior ,radio etc, when it won't start the radio light does dim somewhat but I don't know if it does that all the time. I am laid off so a trip to the saturn garage is looking really expensive but i don't know what else to do. Any suggestions other than kicking it again?